Ocean life
Rare deep-sea fish filmed in 4K for first time
Scientists captured unprecedented footage of the elusive barreleye fish using high-resolution cameras during a deep-sea expedition off California.
Reported by Phys.org · · 1 min read
Marine researchers have filmed a rarely seen deep-sea fish in high resolution for the first time. The barreleye fish, known scientifically as Macropinna microstoma, was captured on camera during an expedition 90 kilometers offshore in waters approximately 600 meters deep. This marks the Monterey Bay Aquarium Research Institute's 11th observation of this unusual species since beginning deep-sea surveys nearly 40 years ago.
The footage was recorded during an eight-day expedition using the remotely operated vehicle Doc Ricketts. Researchers exploring the ocean's twilight zone were studying gelatinous animals when they encountered the barreleye. The discovery occurred as the team was wrapping up operations for the day, with most scientists preparing specimens in the wet lab when the fish was spotted. The sighting drew crew and researchers back to the control room to observe the animal.
The barreleye's most distinctive feature is its transparent head shield, which protects its upward-facing tubular eyes. When the fish spots prey above, its eyes rotate beneath the gelatinous dome to maintain visual contact. This adaptation allows the fish to hunt small crustaceans while avoiding the stinging tentacles of deep-sea siphonophores where the prey often hide.
The research team spent 20 minutes observing the fish, using a 4K camera to document its body and behavior. They adjusted lighting conditions to highlight the transparent head and even captured 3D stereo imagery with the ROV's VR camera. While the scientists did not collect the specimen, the footage provides valuable data about this elusive species and its adaptations to life in the deep ocean's dimly lit waters.
This sighting represents MBARI's first 4K recording of the barreleye and the first from its new flagship research vessel. The institute has only encountered this species 11 times in decades of exploration, with the previous observation occurring in 2021. The footage will support ongoing research into how deep-sea animals process visual information in the ocean's midwater environment.
